1. Idaho officially became a state on July 15, 1890. This was a significant moment in Idaho history, as it marked the end of the territory's status and the beginning of a new era of statehood.

2. On July 15, 1917, the famous folk singer and activist Woody Guthrie was born in Okemah, Oklahoma. Although Guthrie was not born in Idaho, he spent time living in the state and performing at various venues throughout his career.

3. In 1931, the world's first ski lift was built in Sun Valley, Idaho. This landmark invention revolutionized the skiing industry and paved the way for the modern ski resort.

4. July 15, 1972, was a somber day in Idaho history, as the brutal murder of a young woman named Cassie Hansen took place. Hansen's killer, Arthur Shawcross, was eventually caught and confessed to the crime, but the incident left a lasting impact on the state and its residents.

5. In 2003, the city of Boise, Idaho, made national news when a group of activists staged a protest against the war in Iraq. The demonstration, which involved blocking a federal courthouse building and resulting in dozens of arrests, highlighted the deep divide in the United States over the conflict at the time.